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. 2015 Jan 9;49(9):583–589. doi: 10.1136/bjsports-2014-094104

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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A ‘Preferred Reporting Items for Systematic Reviews and Meta-Analyses’ (PRISMA) flow chart outlining the study identification, screening, eligibility, inclusion and analysis for the present systematic review.